I was planning to use electric cloud for durable streams recently and found out they are winding it down post acquisition.
Unfortunate timing and self hosting isn't complex or anything but still as you said, durable streams as a project is most likely going to be abandoned.
True, there are also a lot of open PRs and issues. I'm surprised no other developers or orgs are stepping in to keep the project afloat. No wonder the Apache Way goes a long way! Either way, their approach of building around an open-protocol was a good decision.
If you'd like to consider using PicoMQ, I have examples to deploy on Fly.io and AWS. ursula.tonbo.io is also a good option to try.